Spray gun with removable discharge tube



June 22, 1937. w, ROSE SPRAY GUN WITH REMOVABLE DISCHARGE TUBE Filed Oct. 16, 1935 Patented June 22, 1937 UNITED STATES SPRAY WITH REMgVABLE DISCHARGE TUB William H. Rose, Jersey City, N. J., assignor to Stanco Incorporated, a corporation of Delaware Application October 16, 1935, Serial No. 45,276

6 Claims.

This invention relates to improvements in spray guns, particularly of the hand operated, continuous type adapted for various purposes, such as the spraying of insecticidal solutions.

5 An object of the invention is to provide a simplifled construction, capable of efl'icient operation throughout long periods of service, in which the discharge tube is mounted for ready removal and cleaning. I

A further object is to provide a device in which the discharge of non-vaporized liquid is prevented at all inclinations in which the spray gun is likely to be used. I I A further object is to improve the construction- 15 of the mixing chamber and discharge opening in devices of this kind and to locate these parts in a novel and advantageous position on the upper part of the barrel of the spray gun.

The foregoing and other objects of the ingo vention will be clear from the following description read in connection with the accompanying drawing, in which Fig. l is a vertical section through a preferred type of spray gun;

as Fig. 2 is a front elevation of the same;

Fig. 3 is an enlarged detail sectional view of a modified type of discharge opening;

Fig. 3a is a phantom front view, in enlarged detail of the modified type of discharge opening 30 shown in Fig. 3.

Fig. 4 is a detail view of a discharge tube having means for facilitating removal;

Fig. 5 is a detail view of a discharge tube having centering means; and

Fig. 6 is a plan view taken at IIII of Fig. 5.

Referring first to Figs. 1 and 2, reference numeral l denotes a liquid reservoir and 2 a spray gun barrel, both of which may be of the conventional type. The invention is particularly 40 adapted for continuous sprayers and in the form shown there is the usual check valve 3 in a partition 4. The plunger 5, the end cap 6, closing the front (filling) opening, and end cap 1, clsing the plunger chamber, may be of any desired form. Preferably a gasket 8 is provided under cap 6 to prevent the escape of fluid and to make the construction air tight.

An important novel feature of the invention is 50 the discharge tube 9, preferably straight, arranged in a sleeve III which is fastened by soldering or otherwise to the upper part of barrel 2. The sleeve is closed by a cap II which is secured to the sleeve by screw threads, a friction 55 fit, or the like, and is adapted for easy removal.

This construction provides a sort of turret on the top of the gun barrel.

The discharge tube has its lower end resting on the bottom of the liquid reservoir I in the form shown, although it may be supported clear of the bottom, as later described. There is sufficient opening between the edge of the tube bottom and the curve of the reservoir to permit the entry of liquid into the tube, to be drawn up through it when air is forced past the outlet of the tube on the instroke of the plunger and when the built-up pressure is discharged on the outstroke. The ball valve 3 is arranged for this type of continuous spraying. The tube has a limited freedom of motion in the sleeve and can be readily lifted out for cleaning.

There is in the cap II a small opening [2 through which the atomized liquid is discharged. The space l3 between the top of the cap and the upper end of tube 9 serves as a mixing chamber in which the air and the liquid are commingled for discharge as a spray through opening [2.

Referring to Fig. 3, a modified form of the discharge fitting is shown. This comprises a casting or other suitable member M in which there is a mixing chamber of inverted funnel form having an outlet passage 16. The passage terminates with edges flaring outwardly as at H toform a funnel shaped mouth.

Although it is readily possible to remove discharge tube 9 shown in Fig. 1 simply by unscrewing cap H and lifting the tube out with the fingers, it is a little more convenient to attach a device such as the small handle l8 shown in Fig. 4.

The limited play of the tube in sleeve I0 does no harm, but if positive centering of the tube is desired, this may be accomplished by providing one or more arms I9,- Fig. 5, attached near the upper end of the tube and of such length and distancefrom the top as to support the tube on the sleeve and prevent it from slipping sideways toward the sleeve.

Spray devices sometimes become clogged after extended use, due to the presence of solid or gummy material which gets into the reservoir. In the ordinary type of spray gun it is very dinicult, if not impossible, to clean the discharge tube and restore the spray gun to its normal functioning. In the present device this cleaning is accomplished very easily by taking out the tube as described and running a straw or small wire through it. It is preferred to use a straight tube but the cleaning can be accomplished readily enough even though curved tubes are provided.

A further defect of certain types of spray gun is their tendency to discharge solid streams of liquid, instead of atomized liquid if the spray gun is held at a sharp angle up or down. This is due to the fact that the discharge opening is placed low on the barrel, usually in the end. In the present invention it will be seen that the discharge opening is placed on the top of the barrel, so that even though the spray gun is held at sharp angles, solid streams of liquid will not be discharged.

Also I have found that it is not only convenient to have the spray discharge from a mixing chamber above the barrel instead of at the end, as in the common type of sprayer, but also results in a considerable simplification. The mixing chamber (l3, l5 provided in the turretlike construction (I0, ll) avoids the necessity for providing a plate having a number of air distributing openings around a central discharge tube. The reservoir may be filled through the mixing chamber, but it is preferred to provide a separate filling opening, such as the end cap 6.

The construction described is for illustration only and various changes and alternative arrangements may be made within the scope of the appended claims, in which it is my intention to claim all novelty inherent in the invention as broadly as the prior art permits.

I claim:

1. A spray gun including a pump barrel, a reservoir carried thereby and a discharge assembly comprising an annular sleeve secured in an opening in a side wall of the pump barrel, 9. discharge tube freely positioned therein and removable through the sleeve, said tube extending through the barrel and continuing into closely spaced relation to the bottom of the reservoir, and a removable cap for the sleeve free of said tube and forming with said sleeve a chamber surrounding the tube end, said cap having a discharge port communicating with the chamber.

2. Apparatus according to claim 1, in which the tube has a. lifting device attached thereto and extending into the chamber surrounding the tube end.

3. Apparatus according to claim 1, in which the discharge tube is straight.

4. A spray gun according to claim 1, in which the discharge tube is positioned within the sleeve, with its upper end in the chamber formed by the cap and sleeve, by means of radial arms on the tube disposed in diametrically opposed pairs spaced circumferentially and longitudinally of the tube, of which one pair freely engages the upper end of the sleeve and another freely engages the inner wall of said sleeve adjacent its lower end.

5. A spray gun according to claim 1, in which the annular sleeve is disposed in an opening in the top of the pump barrel, protruding therefrom, and which with the cap therefor forms a turret-like discharge member for the gun.

6. A spray gun including a pump barrel, a reservoir, a discharge assembly extending through a side wall of said pump barrel and a means for replenishing said reservoir comprising a pressure chamber in the pump barrel, communicating with a nozzle in the discharge assembly and with the reservoir, opening outwardly through one end of said barrel, and a removable closure for said chamber which, when the closure is removed, provides a passageway through which the reservoir may be filled.

WILLIAM H. ROSE. 

